According to Bloomberg the French government has admitted that “pressing ahead to complete it by the end of 2023, as planned, would have been too disruptive for commuters who travel on a suburban train that connects stations between the airport and central Paris”.

The 32km CDG Express has been designed to alleviate overcrowding on the existing RER B rail line which also serves Paris CDG. According to the Bloomberg report, 56 per cent of trips to the airport are currently undertaken by road.

Business journal Railway gazette said that the CDG Express project “has proved highly controversial, especially along the routes of RER lines B and E where local officials were concerned that provision of an airport express could reduce the capacity available for suburban trains”.